Direct indicator device for determining the cardiac output flow

Details Direct indicator device for determining the cardiac output flow Direct indicator device for determining the cardiac output flow

1975-04-28

1977-01-25

Pinkham, Richard C.

Surgery

Truss

Perineal

73204, A61B 502

Patent

active

040045765

ABSTRACT:
A direct indicator device for determining the cardiac output according to the thermodilution method embodying two temperature sensors connected to the blood circulation for respectively determining the inlet- and dilution temperatures. A clock generator and a scaler connected at the output of the clock generator are provided, the scaler forming a control signal. A respective one of the sensors is connected in circuit with inputs of an associated temperature-pulse frequency converter, the outputs of which are connected with a respective input of a multiplexer. A control input of the multiplexer connected with the output of the scaler serves for the alternate switching-through of a signal from one input and from the other input of the multiplexer to the output thereof in time-dependent function of the control signal. A gate circuit has one input connected with the output of the multiplexer, another input connected with the output of the clock generator and a further input connected with the output of the scaler. The gate circuit has an output at which there appears the clock rate of the clock generator as a function of time on the one hand of the control signal and on the other hand of the signal at the output of the multiplexer, the output of the gate circuit being connected with the input of a counter. The output of the counter is connected with the input of an intermediate storage, and a control input of the counter and a control input of the intermediate storage are connected at the output of the scaler for the summation of the clock repetition rate delivered to the counter and for the storage thereof as a function of time of the control signal. A digital computer has connected therewith a digital indicator device, the computer having inputs connected respectively with the output of the intermediate storage, the output of the clock generator and the output of the scaler.

REFERENCES:
patent: 3446073 (1969-05-01), Auphan et al.
patent: 3678922 (1972-07-01), Philips
patent: 3777133 (1973-12-01), Beck et al.
patent: 3789831 (1974-02-01), Kopaniky
patent: 3820393 (1974-06-01), McGunigle
patent: 3905229 (1975-09-01), Togio et al.
patent: 3915155 (1975-10-01), Jacobson et al.

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